/Engine/Source/Runtime/Engine/Public/MaterialShared.h
Begins caching the material shaders for the given static parameter set and platform. This is used by material resources of UMaterials.
void BeginCacheShaders ( EShaderPlatform Platform, EMaterialShaderPrecompileMode PrecompileMode, const [ITargetPlatform](API\Developer\TargetPlatform\Interfaces\ITargetPlatform) * TargetPlatform, [TUniqueFunction](API\Runtime\Core\Templates\TUniqueFunction)< void(boolbSuccess)> && CompletionCallback )